"Is a 5 5/8' overhang too little for a breakfast bar?"

It is if you plan to sit at the breakfast bar.

Is this a custom home or a tract home?

What do the drawings show?

Who determined the overhang to be 5 5/8" ?

Make a 12" overhang minimum and clip it so it dies right behind the window casing please. Or skip it altogether.

5-5/8" is much too shallow! The minimum recommended overhang is 15" for counter-height seating (12" for bar-height -- 42" off the finished floor).

Is there room to move the cabinets to the right 10" or so and still have decent aisles?

Will there be trim on the windows or will they be trim-less (many home have no window trim). If there's no trim, then maybe just have the overhang go into the window area. You should still be able to open/close the window if needed.

If there is trim, then your best option would probably be to eliminate the overhang altogether.

Less palatable alternative...can the window be changed to be raised? It will be more expensive.

No 5 5/8" is nowhere near deep enough for a breakfast bar. Who designed this?

@Joseph Corlett, LLC said exactly what I was thinkibg about this.

That’s way too small to eat at. If you post more pictures and a floor layout people may be able to help with ideas for how to get an eating space.